Synthesis and Characterization of Glycoconjugates

Glycoconjugates, molecules in which carbohydrates are covalently linked to proteins, lipids or other scaffolds, occupy a central role in cellular communication, immune recognition and therapeutic design. The chemical synthesis of these entities demands precise control over stereochemistry and regiochemistry, often achieved through iterative glycosylation reactions employing activated donors and protected acceptors. Strategies range from classical promoter-mediated glycosylations to modern chemoenzymatic and automated approaches, enabling access to complex oligosaccharide sequences and long polysaccharide chains. Characterisation combines high-resolution mass spectrometry, multidimensional nuclear magnetic resonance spectroscopy and chromatographic separation, alongside microarray and binding assays to assess function. Recent innovations in radical and photoredox catalysis, one-pot assembly and on-chip synthesis have accelerated the construction of structurally defined glycoconjugates. These advances underpin applications in vaccine development, targeted drug delivery and biomaterials, illustrating the global significance of rigorous synthesis and analytical methodologies in glycobiology and translational research.

Research from Nature Portfolio

Recent studies have introduced a dehydroxylative radical route to N-glycosylated heterocycles via copper metallaphotoredox catalysis. This method activates stable 1-hydroxy carbohydrates under mild, aqueous-tolerant conditions, delivering a broad array of N-glycosides with high stereoselectivity and site-selectivity across diverse bioactive substrates. Late-stage functionalisation of drug molecules demonstrates its utility in pharmaceutical modification. In earlier work, a highly convergent preactivation-based one-pot glycosylation protocol enabled the total synthesis of a 92-mer mycobacterial arabinogalactan. By coupling large oligosaccharide fragments in a single operation, this approach overcame longstanding efficiency barriers in polysaccharide assembly, setting a benchmark for the synthesis of long, branched carbohydrate chains with precise structural definition.

Synthesis and Characterization of Glycoconjugates publication trend

The graph below shows the total number of articles in synthesis and characterization of glycoconjugates across all publications each year (not limited to Nature Index journals).

Technical terms

Glycoconjugate: A molecule composed of one or more carbohydrate chains covalently linked to a protein, lipid or other moiety.

Glycosylation: The chemical or enzymatic formation of a glycosidic bond between a sugar donor and an acceptor molecule.

One-pot glycosylation: A synthetic protocol in which multiple glycosylation steps occur sequentially in the same reaction vessel without intermediate purification.

Metallaphotoredox catalysis: A dual-catalyst approach combining metal catalysis with photoredox activation to generate reactive intermediates under light irradiation.

Glycan microarray: A high-throughput platform where diverse carbohydrate structures are immobilised on a surface for binding studies with proteins or cells.

References

1. Advances in glycoside and oligosaccharide synthesis. Chemical Society Reviews (2023).
2. VaporLIFT: On‐Chip Chemical Synthesis of Glycan Microarrays. Advanced Functional Materials (2024).
3. Dehydroxylative radical N-glycosylation of heterocycles with 1-hydroxycarbohydrates enabled by copper metallaphotoredox catalysis. Nature Communications (2024).
4. Total synthesis of mycobacterial arabinogalactan containing 92 monosaccharide units. Nature Communications (2017).
5. Discovery of Semi- and Fully-Synthetic Carbohydrate Vaccines Against Bacterial Infections Using a Medicinal Chemistry Approach. Chemical Reviews (2021).